MCQ
Two isomers $'A'$ and $'B'$ with molecular formula $C _{4} H _{8}$ give different products on oxidation with $KMnO _{4}$ in acidic medium. Isomer ' $A$ ' on reaction with $KMnO _{4} / H ^{+}$results in effervescence of a gas and gives ketone. The compound ' $A$ ' is ...... .
- ABut$-1-$ene
- Bcis-But$-2-$ene
- Ctrans-But$-2-$ene
- ✓$2-$methyl propene


